PHP Behavior on array key exist check

[vishal]

Hi All,

Following script giving some non expected result.

<?php

$myarray = array('firstName', 'lastName', 'companyName', 'jobTitle');

foreach($myarray as $attributeName=>$attributeData)

{

if(isset($attributeData['hiddenValue']) && !empty($attributeData['hiddenValue']))

     {

print $attributeData['hiddenValue']." testing<br/>";

}

}

Output:

f testing
l testing
c testing
j testing

Why on earth this $attributeData['hiddenValue'] consider first character in string? I found this coding bug in zurmo opensource CRM and giving failed test case result.

Is this the way php string to array behave?

Regards,

Vishal

[Robert Gonzalez]

Is $myarray a true array or an instance of an Array object of some sort? I'm asking because in your example you would never get to your print statement because your isset/!empty check (which is redundant by the way) would always be false UNLESS the string 'hiddenValue' is somehow being cast to an integer. The integer value of the string 'hiddenValue' is 0, and since since $attributeData, in each iteration, is a string, the 0th character of the string would be it's first letter.

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Robert Gonzalez

   

[vishal bhandare]

Hi Robert,

$myarray is true array, I agree to your point 

The integer value of the string 'hiddenValue' is 0 

string 'hiddenValue' is somehow being cast to an integer

This statement helped me to debug more into details. I found below warning on php.net

[vishal bhandare]

Hi All,

Sorry for incomplete previouse mail. Below is warning found on

http://www.php.net/manual/en/language.types.string.php

Warning

Writing to an out of range offset pads the string with spaces. Non-integer types are converted to integer. Illegal offset type emits E_NOTICE. Negative offset emits E_NOTICE in write but reads empty string. Only the first character of an assigned string is used. Assigning empty string assigns NULL byte.

So any string offset to access character need to be integer else php will convert non-integer to integer that is 0. Hence will return first character

Regards,

Vishal

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